we went to lake heyburn here in oklahoma yesterday and we saw something kind of odd on the way out..there was this small fenced in area with signs on it that said "us government property keep out" or something like that on it..it looked like a very small marshy area. it was odd because that was the only fenced in place like that. would anyone know what it was about? i called the lake office but they werent there so i figured maybe someone here might know.